Rock Image Segmentation Based on Wavelet Transform and Watershed Algorithm

Abstract

In order to obtain information of the reservoir micropore, and extract its spatial topological structure, wavelet transform and watershed algorithm are combined to segment rock images. Firstly, wavelet hard threshold algorithm and wavelet soft threshold algorithm are applied, respectively, to remove rock image noises. Secondly, watershed algorithm is used to segment rock images that not being denoised, denoised by wavelet hard threshold algorithm, and wavelet soft threshold algorithm for characteristics extraction of microscopic pore. Lastly, application results of these three methods for segmentation of rock images are compared and analyzed. The comparative results show that the best segmentation method for rock images is the combination of wavelet soft threshold algorithm and watershed algorithm, the combination of wavelet hard threshold algorithm and watershed algorithm is better, and the single watershed algorithm is the worst. The comparative results also show combination of wavelet soft threshold algorithm and watershed algorithm could segment rock images and extract their spatial topological structures accurately. The rock image segmentation based on wavelet soft threshold algorithm and watershed algorithm overcomes shortcomings of other methods and lays an important foundation for 3D reconstruction of the rock pore structures.

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This paper was prepared for presentation at the 2017 International Field Exploration and Development Conference in Chengdu, China, 21–22 September 2017.

This paper was selected for presentation by the IFEDC&IPPTC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IFEDC&IPPTC Committee and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC&IPPTC Committee, its members. Papers presented at the Conference are subject to publication review by Professional Committee of Petroleum Engineering of Shaanxi Petroleum Society. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of Shaanxi Petroleum Society is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IFEDC&IPPTC. Contact email: paper@ifedc.org or paper@ipptc.org.